Bulletin of the American Physical Society
52nd Annual Meeting of the APS Division of Atomic, Molecular and Optical Physics
Volume 66, Number 6
Monday–Friday, May 31–June 4 2021; Virtual; Time Zone: Central Daylight Time, USA
Session E08: Quantum Metrology and SensingLive
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Chair: Olivier Pfister, UVA |
Tuesday, June 1, 2021 2:00PM - 2:12PM Live |
E08.00001: Bias in error-corrected quantum sensing Ivan Rojkov, David Layden, Paola Cappellaro, Jonathan P Home, Florentin Reiter Quantum-enhanced sensors use quantum systems and effects to sense an external signal in their environment, such as electromagnetic fields, temperature or pressure. They also, however, experience decoherence due to this same environment, which limits their sensitivity in practice. Quantum error correction (QEC) can enhance this sensitivity by suppressing decoherence [1]. |
Tuesday, June 1, 2021 2:12PM - 2:24PM Live |
E08.00002: Scalable quantum logic spectroscopy using a Schrӧdinger cat interferometer Kaifeng Cui, Kevin Boyce, David Leibrandt, David Hume Quantum logic spectroscopy[1] (QLS) is a technique that allows for precision spectroscopy of atomic or molecular ions that lack suitable transitions for laser cooling and detection. However, due to the requirements such as ground state cooling, this technique does not scale easily to large numbers of spectroscopy ions. Here we present a method that extends QLS to larger numbers of spectroscopy ions based on the Schrӧdinger cat interferometer[2]. We have demonstrated this method on linear and non-linear chains of up to 6 ions. Similar to what has been used for the detection of single-photon scattering events[3], 25Mg+ions are employed to sense a state-dependent driving force applied to the co-trapped 27Al+ions. Our results show an improved measurement speed of the 1S0 →3P0 transition in 27Al+with increased number of 25Mg+ions under Doppler cooling, which opens the way of improving the clock stability by using multiple 27Al+ions. |
Tuesday, June 1, 2021 2:24PM - 2:36PM Live |
E08.00003: Demonstration of Hamiltonian amplification in a trapped ion system Hannah M Knaack, Shaun C Burd, Christian Arenz, Raghavendra Srinivas, Alejandra L Collopy, Laurent Stephenson, Andrew C Wilson, David J Wineland, Dietrich Leibfried, John J Bollinger, David T Allcock, Daniel H Slichter In quantum physics, it is often desirable to be able to increase the strength of an interaction Hamiltonian beyond what is natively available in the system. Squeezing can be used to amplify certain types of quantum interactions, but typically some knowledge of the interaction is required for effective amplification. This poses a challenge for quantum sensing applications where the interaction Hamiltonian may not be fully known. We implement a proposal [Arenz et al., Quantum 4, 271 (2020)] for phase-insensitive amplification of arbitrary interaction Hamiltonians coupling to a quantum harmonic oscillator with the form H = βa† + β†a. We realize the quantum harmonic oscillator in the motion of a single trapped 25Mg+ ion, and perform amplification via a series of rapid squeezing pulses along alternating quadratures. We demonstrate the phase-insensitive amplification of a coherent displacement Hamiltonian by ∼3.4, and of a Jaynes-Cummings Hamiltonian by ∼1.5. Phase-insensitive amplification of small displacements could be useful for quantum sensing applications such as dark matter detection. |
Tuesday, June 1, 2021 2:36PM - 2:48PM Live |
E08.00004: Approaching the Heisenberg Limit with a time-reversal Hamiltonian Edwin Pedrozo Penafiel, Simone Colombo, Albert F Adiyatullin, Chi Shu, Zeyang Li, Enrique Mendez, Vladan Vuletic Reaching the Heisenberg limit is one of the long-sought goals in Quantum Metrology. Non-Gaussian Entangled States (NGES) with a large amount of entanglement have been proposed to approach such a limit. However, NGES are fragile against decoherence and depend on the challenging requirement of having single-particle state resolution, halting experimental progress for application to atomic sensors with today's technology. |
Tuesday, June 1, 2021 2:48PM - 3:00PM Live |
E08.00005: Motional quantum sensing beyond the standard quantum limit with 2D arrays of trapped ions Matthew J Affolter, Kevin Gilmore, Robert J Lewis-Swan, Diego E Barberena, Elena Jordan, Ana Maria Rey, John J Bollinger Quantum sensing protocols using trapped-ions can enable the detection of weak electric fields (<1 nV/m) by sensing displacements surpassing the Standard Quantum Limit (SQL) – the sensitivity achievable with a motional coherent state. Here, we present experiments of a many-body quantum-enhanced sensor to detect weak displacements and electric fields using large 2D crystal arrays of approximately 150 trapped ions. The center-of-mass vibrational mode of the crystal serves as a high-Q mechanical oscillator and the collective electronic spin as the measurement device. |
Tuesday, June 1, 2021 3:00PM - 3:12PM Live |
E08.00006: Quantum-enhanced sensing of displacements and electric fields with large trapped-ion crystals Diego E Barberena, Kevin Gilmore, Matthew J Affolter, Robert J Lewis-Swan, Elena Jordan, Ana Maria Rey, John J Bollinger We theoretically analyze the protocol used for implementation of a quantum enhanced sensor of displacements and electric fields in a large crystal of trapped ions (N=150). The protocol uses the center of mass vibrational mode (COM) of the crystal as a high-Q mechanical oscillator and lets it interact with the ions' collective electronic spin, which works as the readout degree of freedom. We derive an effective model of coupled oscillators encompassing both the spins and the COM of mode and demonstrate that the spin-boson entanglement at the core of the protocol can be understood as the squeezing dynamics of this pair of oscillators. This allows us to explain experimental observations that use this system for electric field and displacement measurements with a sensitivity that surpasses both the standard quantum limit and typical thermal bounds for uncorrelated initial states. This provides both fundamental and practical advantages with respect to the use of purely classical resources. |
Tuesday, June 1, 2021 3:12PM - 3:24PM Live |
E08.00007: A Guided Matterwave Interferometer with Cavity-Aided QND Readout Chengyi Luo, Graham P Greve, Baochen Wu, James K Thompson Cavity-QED based approaches have succeeded in generating large amounts of entanglement enhancements beyond the standard quantum limit (SQL), which sets a fundamental imprecision on all quantum sensors with unentangled atoms [1,2]. It is now of great interest to apply these cavity-QED approaches to enhance a broad range of quantum sensors including atomic clocks [3] and matterwave interferometers. Here, we demonstrate a rubidium matterwave interferometer with atoms guided by a blue-detuned hollow optical dipole trap as they free-fall along the axis of a high-finesse cavity with cooperativity C≈1. We also demonstrate cavity-enhanced quantum non-demolition (QND) readout of the matterwave interferometer with added readout noise as much as 10 dB below the projection noise level. We will conclude by discussing our efforts to further improve the QND measurements to realize an entangled interferometer with sensitivity surpassing the SQL. |
Tuesday, June 1, 2021 3:24PM - 3:36PM Live |
E08.00008: Quantum Enhanced Cavity QED Interferometer with Partially Delocalized Atoms in Lattices Anjun Chu, Peiru He, James Thompson, Ana Maria Rey We propose a quantum enhanced interferometric protocol for gravimetry and force sensing using cold atoms in an optical lattice supported by a standing-wave cavity. By loading the atoms in partially delocalized Wannier-Stark states, it is possible to cancel the undesirable inhomogeneities arising from the mismatch between the lattice and cavity fields and to generate spin squeezed states via a uniform one-axis twisting model. The quantum enhanced sensitivity of the states combined with subsequent implementation of a compound pulse sequence, that allows to separate atoms by several lattice sites, together with the capability to load small atomic clouds in the lattice at micrometric distances from a surface, make our setup ideal for sensing short-range forces. We show that for arrays of 104 atoms, our protocol can reduce the required averaging time by a factor of 10 compared to current lattice-based interferometers after accounting for major sources of decoherence. |
Tuesday, June 1, 2021 3:36PM - 3:48PM Live |
E08.00009: Continuous loading and transport of strontium atoms in a ring cavity Julia R Cline, Dylan Young, Vera M Schafer, James Thompson We will present continuous loading of cold $^{88}$Sr atoms into a ring cavity in the strong collective atom-cavity coupling regime. Our approach is to guide atoms through a series of spatially separated laser cooling and deceleration stages before using a 3D molasses to capture them into a magic-wavelength conveyor belt-style moving optical lattice supported by the ring cavity. Our continuous, high flux apparatus is an excellent starting point for a continuous wave superradiant laser [1], dead-time free atom interferometers [2], and high-precision atomic clocks [3]. |
Tuesday, June 1, 2021 3:48PM - 4:00PM Live |
E08.00010: Squeezing-while-rotating of Ytterbium-171 atomic ensemble inside an optical cavity Zeyang Li, Simone Colombo, Chi Shu, Edwin Pedrozo Penafiel, Enrique Mendez, Boris Braverman, Vladan Vuletic Spin squeezing states (SSS) are atomic entangled states that can be used to enhance the atomic precision measurements beyond the standard quantum limit. Existing implementations relying on unitary evolution are primarily based on one-axis twisting induced through coherent cavity feedback. By adding an auxiliary driving Rabi field, our work demonstrates richer dynamics of the collective spin than the squeezing effect, and can be integrated with a recently demonstrated time-reversal protocol to further enhance the metrological gain. |
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